/Engine/Source/Editor/EditorFramework/Public/Viewports/InViewportUIDragOperation.h
The constructor is protected, so that this class can only be instantiated as a shared pointer.
FInViewportUIDragOperation ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< class [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > & InUIToBeDragged, const FVector2D InDecoratorOffsetFromCursor, const FVector2D & OwnerAreaSize, FOnInViewportUIDropped & InDropDelegate )